A frictionless pulley hes the shape of a uniform solid disk of mass 2.10 kg and

Question

A frictionless pulley hes the shape of a uniform solid disk of mass 2.10 kg and radius 10cm. A 1.40 kg stone is attached to a very light wire that is wrapped around the rim of the pulley (the figure (Figure 1) ), and the system is released from rest. Part A How far must the stone fall so that the pulley has 3.60J of kinetic energy? Part B What percent of the total kinetic energy does the pulley have? Enter the answer as a percent, not as a fraction. For instance, if the ratio is 0.75, enter this as 75.

Explanation / Answer

m*g*h = 3.6

h = 3.6/(m*g) = 3.6/(1.4*9.81) = 0.262 m

B) Kp/Ktot = (3.6)/(3.6+3.6) = 0.5

50 %

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